Jonathan Haidt is a bestselling author and social psychologist at New York University’s Stern School of Business. In his latest book, “The Anxious Generation”, Haidt explores the alarming effects of excessive screen time on children, and what he calls “the great rewiring” of children's brains as they move from a play-based childhood to a phone-based childhood. Haidt sat down with Hoda Kotb to talk about his plan for a healthier, freer childhood, and steps that parents, teachers and schools can take to end the epidemic of mental illness and restore a more humane childhood.